Fleas are small, wingless insects that are typically about 3 to 4 millimeters long. They have a flat, narrow, and oval-shaped body that is dark brown or reddish-brown in color, which helps them move easily through the fur of their hosts. Fleas have six legs, with powerful hind legs that allow them to jump impressive distances-up to 7 inches or about 150 times their body length. Their bodies are covered with tiny backward-pointing bristles or hair-like structures that aid in gripping and moving through hair or fur. Fleas also have antennae and specialized mouthparts for piercing skin and feeding on blood. They do not have wings and cannot fly, but their jumping ability makes them highly mobile and difficult to catch

. In summary, fleas look like small, flat, dark reddish-brown insects with six legs, no wings, and strong jumping legs, covered with tiny bristles to help them cling to their hosts